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Shiyan regular multi-effect evaporator process

Release time: 2020-02-08 18:11:19

In the entire MVR evaporation crystallization system, there are many control nodes, including the temperature of the feed liquid, the evaporation pressure, the compression ratio of the steam, and the temperature of the condensate water, etc., all have an important relationship with the stability and energy saving optimization of the MVR evaporation crystallization system. In the process of using the MVR evaporation crystallization system, we need to analyze different problems and improve them.

The operating cost of evaporative crystallization equipment is mainly energy consumption. The new generation MVR evaporator is currently recognized as an environmentally friendly evaporation concentration device. It does not require steam. The basic principle is that the secondary steam steamed from the separator is compressed by the compressor and replenishes one tenth of the energy. The steam The temperature increases, the enthalpy increases, and then enters the evaporator heating chamber to provide heat to the circulating materials, while the steam itself condenses and releases latent heat, and the condensed hot water can exchange heat with the raw materials. The cycle is reciprocated. The steam is charged and heated by the compressor. The material is heated and evaporated by the steam, and the steam can be fully condensed into water. The hot water is then pre-heated to the feed. Utilization, raw materials go in, one is crystalline solid, and the other is cooling water at room temperature, which is environmentally friendly and energy saving.

Wastewater evaporation crystallization technology is widely used in the chemical industry. At present, common wastewater evaporation crystallization treatment technologies are multi-effect evaporation technology, thermal steam recompression evaporation technology, mechanical steam recompression evaporation technology, falling film mechanical steam recompression cycle evaporation, etc. technology.

The normal operating conditions and use methods of the three-effect evaporator are also essential for equipment operators, and can be repaired in time when the equipment fails. Several common equipment failures and main reasons of the three-effect evaporator: When the three-effect evaporator fails, it is mainly because the low vacuum is too low to maintain the boiling point of the concentrate, and the temperature of the secondary steam increases, which reduces the heating. The effective temperature between steam and concentrate reduces heat transfer and slows down the rate of steam evaporation, and the heating temperature of the heating material affects the preservation of active ingredients.

Generally, the final effect of the three-effect evaporation is operated under vacuum. Since the secondary steam of the first two effects is used as the heating steam of the next effect, the utilization rate of the raw steam is improved, that is, economical. It should be emphasized that the amount of evaporation is directly proportional to the amount of heat transferred. The three-effect evaporator does not increase the amount of evaporation, but only saves heating steam.

Introduction and features of double-effect evaporators Simply put, two single-effect evaporators are connected in series, and the series mode is divided into three types: co-current, counter-current, and advection. Can be customized according to customer needs. The double-effect evaporation crystallizer effectively combines evaporation and crystallization. It is continuous and stable in the industrial production of chemical wastewater and inorganic salts, and can effectively resist scarring and scaling, and the operating cost is low. Evaporated water can reach recycling or discharge standards in one step, and the desalination effect is good. This equipment has been successfully applied to the treatment of wastewater containing sodium chloride, ammonium chloride, sodium sulfate, ammonium sulfate and sodium thiosulfate.

Leakage of high-temperature corrosive liquids or vapors: This type of leakage often occurs in weak links such as MVR equipment and pipeline welds, flanges, seal packing, expansion joints, etc.

During the long-term use of the falling film evaporator, especially the intermittent use of the equipment, the outer wall of the falling film tube and the condenser will also produce a scale layer that affects heat transfer, and will also affect the production capacity of the evaporator to varying degrees. Therefore, the equipment should be inspected irregularly.

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